CN111979370B - Oxygen lance for blast furnace opening and furnace opening method - Google Patents
Oxygen lance for blast furnace opening and furnace opening method Download PDFInfo
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- CN111979370B CN111979370B CN202010885375.6A CN202010885375A CN111979370B CN 111979370 B CN111979370 B CN 111979370B CN 202010885375 A CN202010885375 A CN 202010885375A CN 111979370 B CN111979370 B CN 111979370B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 239000001301 oxygen Substances 0.000 title claims abstract description 109
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 182
- 229910052742 iron Inorganic materials 0.000 claims abstract description 91
- 239000002893 slag Substances 0.000 claims description 33
- 238000010079 rubber tapping Methods 0.000 claims description 21
- 239000000571 coke Substances 0.000 claims description 16
- 208000008918 voyeurism Diseases 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- 244000144985 peep Species 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 241001669679 Eleotris Species 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a blast furnace opening oxygen lance, which comprises an oxygen lance body and is characterized in that the oxygen lance body comprises a tap hole connecting section and an air source connecting section, wherein the tap hole connecting section comprises a tap hole connecting inner pipe and a tap hole connecting outer pipe, an inner thread section of the air source connecting section is in threaded connection with an outer thread connecting part of the tap hole connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner pipe and the tap hole connecting inner pipe form a communicated oxygen conveying channel. The invention also discloses a method for opening the furnace by using the oxygen lance, which is characterized in that the oxygen lance is divided into the iron notch connecting section and the air source connecting section, wherein the air source connecting section can be recycled, namely, the parts except the iron notch can be effectively recycled, the parts can be disconnected in time, the furnace opening cost can be saved, the manufacturing difficulty can be reduced, only the parts penetrating into the iron notch can be manufactured each time of opening the furnace, the rear section can be reused, and the furnace opening efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of blast furnace blowing-in, and particularly relates to a blast furnace blowing-in oxygen lance and a blowing-in method.
Background
The blast furnace is opened as a complicated systematic work, the heating of the hearth is the key point of the blast furnace opening and is also an important factor for determining the success of the opening, the hearth can be quickly heated by the oxygen lance opening at present, the increasingly serious environment-friendly situation is avoided, and the opening of the iron spout can only be used. The success rate of the open furnace is improved, but the actual effect of the open furnace of the oxygen lance is determined by the use method of the oxygen lance and the specific oxygen and air regulation method, the oxygen lance is improperly used in the open furnace process of the domestic blast furnace, the burning of the oxygen lance is caused, the open furnace time of the blast furnace is prolonged, the hearth is not heated well, the temperature of slag iron is easy to be low, the slag iron does not flow, and great difficulty is caused to iron removal in the open furnace.
The oxygen lance is used for blowing in the furnace in the form of blowing in commonly adopted at present, the sleeve type oxygen lance is mostly used for simply introducing air and oxygen, the operation is coarser and is not accurate through valve adjustment, the oxygen lance is basically burnt out after tapping, recycling is not realized, the oxygen lance is also waste, the oxygen lance adopts a two-section structure, the inner section is deep into a tap hole, the outer section is an outer section, the inner section is not recyclable, the outer section can be directly cut off when tapping is needed by the blast furnace, and the state of the tap hole is easy to control.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a blast furnace oxygen lance and a method for blowing in,
the invention discloses a blast furnace opening oxygen lance, which comprises an oxygen lance body and is characterized in that the oxygen lance body comprises a tap hole connecting section and an air source connecting section, wherein the tap hole connecting section comprises a tap hole connecting inner pipe and a tap hole connecting outer pipe, the tap hole connecting inner pipe is connected with the tap hole connecting outer pipe through a supporting rib, and a first compressed air conveying channel is formed between the tap hole connecting inner pipe and the tap hole connecting outer pipe; the iron notch connecting section is inserted into the iron notch section and provided with a groove, and the other end of the iron notch connecting section is provided with an external thread connecting part;
the air source connecting section comprises an air source connecting inner pipe and an air source connecting outer pipe, and the air source connecting inner pipe is connected with the air source connecting outer pipe through a supporting rib; one end of the air source connecting section is provided with an internal thread section matched with the external thread connecting part of the iron notch connecting section; the air source connecting section of the air source connecting section is connected with a compressed air conveying pipe and an oxygen supply conveying pipe; the compressed air conveying pipe and the oxygen supply conveying pipe are respectively provided with a set of accumulated flowmeter and an instantaneous flowmeter; the air source connecting inner pipe and the air source connecting outer pipe form a second compressed air conveying channel, and the high-pressure air source conveying pipe is communicated with the second compressed air conveying channel; the oxygen supply conveying pipe is communicated with the air source connecting inner pipe; the end part of the air source connecting section at the air source connecting side is provided with a peeping mirror;
the internal thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner pipe and the iron notch connecting inner pipe form a communicated oxygen conveying channel.
The invention also discloses a furnace opening method based on the oxygen lance, which is characterized in that: before the furnace is opened, the iron notch connecting section of the oxygen lance is inserted into the iron notch, and the air outlet is upward;
in the initial stage of furnace opening, i.e. within 5 hours of furnace opening, the coke is burnt at this stage to provide heat for the blast furnace hearthIn the stage of quantity, the coke is burnt, so that firstly, the oxygen gun is ensured not to burn out, the oxygen supply with lower flow rate is controlled, and the supply quantity is 5m 3 Control the compressed air supply with higher flow rate per hour, and the maximum supply amount is 60m 3 The main purpose of the air is to cool the oxygen lance, avoid burning out, observe the state of the iron notch at any time through the peeping mirror, keep the front section of the oxygen lance from lighting; this indicates that the lance front section is unburned.
In the middle stage of furnace opening, i.e. 5-10 hr, small amount of slag is gradually produced, and the flow of oxygen is gradually increased to 8-10m 3 And/h, the flow of the compressed air is kept unchanged, and the flow of the compressed air is adjusted according to the condition of the peep sight; if the inside of the peep hole is still dark, the air flow rate can be properly reduced by 2-3m 3 And/h, continuing to observe the condition in the scope, wherein the condition in the scope is slightly lighted, so that the flow rate of oxygen and air can be kept, if the flow rate is bright and the air flow rate is regulated to the maximum, the flow rate of oxygen can be properly reduced by 2-3m each time 3 The oxygen flow per hour was observed for about 10 minutes, and the next adjustment was performed.
In the latter stage of furnace opening, i.e. one hour before tapping, the tapping of the front tapping hole is required in a specified time, and the oxygen flow is opened to a maximum of 15-20m 3 Reducing the flow rate of compressed air until the flow rate of the compressed air is 0, rapidly heating the temperature of a connecting section of the iron notch, improving the heat quantity of a hearth, and ensuring that an oxygen gun seen from the inside of the peeping mirror is bright until the oxygen gun is burnt and slag iron flows out of a channel of the iron notch;
the gas source connecting section is used for timely disconnecting the gas source connecting position and carrying out tapping operation on the tapping hole if the phenomenon of slag iron burning occurs when the calculated generated slag iron meets the total amount requirement of the first tapping in the process of blowing in; if the condition of slag iron burning does not occur within the specified time, the oxygen is already opened to the maximum value and the compressed air is closed for more than 30 minutes, and the slag iron flow appears when the slag iron flow does not appear yet, the air source connecting section needs to be cut off, and the iron notch is opened, so that the slag iron can flow out in time.
In the whole furnace opening process, peeping is performed according to field observationThe flow rate is regulated according to the condition of the sight glass, and the total consumption of the compressed air is 500-700m 3 The total consumption of oxygen is 80-150m 3 。
The oxygen lance has the advantages and technical effects that as the oxygen lance is divided into the iron notch connecting section and the air source connecting section, the air source connecting section can be recycled, namely, the parts outside the iron notch can be effectively recycled, the oxygen lance can be disconnected in time, the furnace opening cost can be saved, the manufacturing difficulty can be reduced, only the part penetrating into the iron notch is manufactured every time the oxygen lance is opened, the rear section can be reused, and the furnace opening efficiency is greatly improved; in addition, the state change of the iron notch is easy to control, namely the state of the iron notch and the working state of the hearth can be effectively controlled through the accurate adjustment of oxygen and compressed air, the hearth is heated in time, and slag iron is discharged in time.
Drawings
FIG. 1 is a schematic view of an oxygen lance structure;
FIG. 2 is a graph of wind velocity comparisons.
In the figure, 1, an oxygen lance body; 1-1, a tap hole connecting section; 1-10, connecting an iron notch with the inner pipe; 1-11, wherein the iron notch is connected with the outer tube; 1-12, supporting ribs; 1-13, a first compressed air delivery passage; 1-14, an external threaded connection; 1-2, an air source connecting section; 1-20, connecting an air source with the inner pipe; 1-21, an air source is connected with the outer tube; 1-22, supporting ribs; 1-23, internal thread segments; 1-24, compressed air conveying pipes; 1-25, oxygen supply and delivery pipe; 1-26, accumulating flowmeter; 1-27, an instantaneous flowmeter; 1-28, a second compressed air delivery passage; 2. a scope; 3. an oxygen delivery channel.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to FIG. 1, a blast furnace opening oxygen lance comprises an oxygen lance body 1, wherein the oxygen lance body comprises a tap hole connecting section 1-1 and an air source connecting section 1-2, the tap hole connecting section comprises a tap hole connecting inner pipe 1-10 and a tap hole connecting outer pipe 1-11, the tap hole connecting inner pipe is connected with the tap hole connecting outer pipe through a supporting rib 1-12, and a first compressed air conveying channel 1-13 is formed between the tap hole connecting inner pipe and the tap hole connecting outer pipe; the iron notch connecting section is inserted into the iron notch section and provided with a groove, and the other end of the iron notch connecting section is provided with external thread connecting parts 1-14;
the air source connecting section 1-2 comprises an air source connecting inner pipe 1-20 and an air source connecting outer pipe 1-21, wherein the air source connecting inner pipe is connected with the air source connecting outer pipe through a supporting rib 1-22; one end of the air source connecting section is provided with an internal thread section 1-23 matched with the external thread connecting part of the iron notch connecting section; the air source connecting section of the air source connecting section is connected with compressed air conveying pipes 1-24 and oxygen supply conveying pipes 1-25; the compressed air delivery pipe and the oxygen supply delivery pipe are provided with accumulating flow meters 1-26 and instantaneous flow meters 1-27; the air source connecting inner pipe and the air source connecting outer pipe form a second compressed air conveying channel 1-28, wherein the high-pressure air source conveying pipe is communicated with the second compressed air conveying channel; the oxygen supply conveying pipe is communicated with the air source connecting inner pipe; the end part of the air source connecting section at the air source connecting side is provided with a peeping mirror 2;
the internal thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner pipe and the iron notch connecting inner pipe form a communicated oxygen conveying channel 3.
The invention also discloses a furnace opening method based on the oxygen lance, before the furnace is opened, a tap hole connecting section of the oxygen lance is inserted into the tap hole, and an air outlet is upward;
in the initial stage of opening the furnace, i.e. within 5 hr of opening the furnace, the coke is burnt in this stage to provide heat for the blast furnace hearth, and the coke is burnt in this stage, so that the oxygen lance is firstly ensured not to burn out, and the oxygen supply with lower flow rate is controlled, and the supply amount is 5m 3 Control the compressed air supply with higher flow rate per hour, and the maximum supply amount is 60m 3 The main purpose of the air is to cool the oxygen lance, avoid burning out, observe the state of the iron notch at any time through the peeping mirror, keep the front section of the oxygen lance from lighting; this illustrates an oxygen lanceThe front section is unburned.
In the middle stage of furnace opening, i.e. 5-10 hr, small amount of slag is gradually produced, and the flow of oxygen is gradually increased to 8-10m 3 And/h, the flow of the compressed air is kept unchanged, and the flow of the compressed air is adjusted according to the condition of the peep sight; if the inside of the peep hole is still dark, the air flow rate can be properly reduced by 2-3m 3 And/h, continuing to observe the condition in the scope, wherein the condition in the scope is slightly lighted, so that the flow rate of oxygen and air can be kept, if the flow rate is bright and the air flow rate is regulated to the maximum, the flow rate of oxygen can be properly reduced by 2-3m each time 3 The oxygen flow per hour was observed for about 10 minutes, and the next adjustment was performed.
In the latter stage of furnace opening, i.e. one hour before tapping, the tapping of the front tapping hole is required in a specified time, and the oxygen flow is opened to a maximum of 15-20m 3 Reducing the flow rate of compressed air until the flow rate of the compressed air is 0, rapidly heating the temperature of a connecting section of the iron notch, improving the heat quantity of a hearth, and ensuring that an oxygen gun seen from the inside of the peeping mirror is bright until the oxygen gun is burnt and slag iron flows out of a channel of the iron notch;
the gas source connecting section is used for timely disconnecting the gas source connecting position and carrying out tapping operation on the tapping hole if the phenomenon of slag iron burning occurs when the calculated generated slag iron meets the total amount requirement of the first tapping in the process of blowing in; if the condition of slag iron burning does not occur within the specified time, the oxygen is already opened to the maximum value and the compressed air is closed for more than 30 minutes, and the slag iron flow appears when the slag iron flow does not appear yet, the air source connecting section needs to be cut off, and the iron notch is opened, so that the slag iron can flow out in time.
In the whole furnace opening process, the flow rate is regulated according to the condition of observing the peep sight on site, and the accumulated total amount of the compressed air is 500-700m 3 The total amount of oxygen is 80-150m 3 。
Experimental effect comparison:
the traditional blowing method is used for blowing in:
in 2012, the furnace is opened for the second time, a sleeper filling method is adopted, and a gas delivery pipe injection mode is adopted for the air supply iron notch. 2012. The air supply is ignited for 1 day of 4 months, and the first iron is discharged after 14 hours due to the slow speed of the early stage air supply, the physical heat is 1477 ℃, the Si content in the iron is 1.07 percent, and the slag is dried. The subsequent air opening and air adding speed is relatively slow, the air quantity reaches 6000m3/min after 4 months and the air quantity reaches 7018t after 4 months and 8 days. The furnace is opened for 8 days, and the normal state is basically recovered.
In 2014, the furnace is opened for the third time, a sleeper filling method is adopted, and a gas delivery pipe injection mode is adopted for the air supply iron notch. 2014. The first iron is discharged after the air supply is ignited for 30 days in 11 months and the first iron is discharged after 20 hours, so that the air volume of the air in the furnace is continuously withered, the iron notch is repeatedly burned for a long time, the iron is discharged from the iron notch of No. 4, the physical heat is 1380 ℃, the Si content in the iron is 2.07%, and water slag is removed. The subsequent recovery is smooth, the air quantity reaches 6000m3/min in 12 months and the yield reaches 6910t in 5 days in 12 months. The furnace is opened for 5 days, and the normal state is basically recovered.
The fourth furnace opening is carried out in 2016, a sleeper filling method is adopted, and a gas delivery pipe injection mode is adopted for the air supply iron notch. 2016. And (3) igniting and blowing for 17 days of 5 months, discharging first iron in 6.5 hours, wherein the physical heat is 1314 ℃, the Si content in the iron is 0.12%, and water slag is removed. The air quantity of the air at the day of 5 months and 19 days reaches 5900m3/min, but due to equipment problems, the air distributor leaks, the forced damping down is carried out for 2 hours for the day of 5 months and 20 days, the recovery of the furnace condition is difficult, the high air quantity of the pressure difference is not added, the air quantity is returned to 5900m3/min until the air quantity of the air at the day of 5 months and 22 days is increased, the yield of the air at the day of 5 months and 23 days is higher than 6000t and reaches 6497t, the yield of the air at the day of 5 months and 25 days reaches 6920t, and the recovery basically returns to the normal state after 9 days.
In 2018, the fifth furnace opening is performed, a sleeper filling method is adopted, and an oxygen lance inserting mode is adopted for an air supply iron notch, so that the original injection mode of a hearth gas delivery pipe is replaced. And after 7 hours, the first iron is discharged after 26 days of 2018 and 6 months of ignition and air supply, the physical heat is 1250 ℃, the Si content in the iron is 0.17%, and water slag is removed. And then the furnace condition is difficult to recover, the full coke is changed from 7 months to 4 days and the wind gap is blocked from 7 months to 6 days, the furnace condition is recovered until the wind quantity is returned to 6000m3/min at 7 months and 8 days, and the yield reaches 6040t/d at 7 months and 10 days. The normal production state is basically restored after 14 days from the furnace opening.
4 oxygen guns are pre-buried in 4 iron holes before blowing in 2020, the oxygen guns are used for replacing gas delivery pipes to blow in, so that the heating of a hearth is facilitated, the communication between an iron hole area and a tuyere is facilitated, the tapping difficulty of iron for the first time of blowing in can be greatly reduced, conditions are created for subsequent blowing in and coke reduction ratio, and meanwhile, a large amount of gas is prevented from being blown out. However, if the ratio of the air to the oxygen is controlled poorly, the oxygen lance is burnt out in advance, so that the tap hole area is not ventilated, and the tapping difficulty is increased reversely. In order to accurately control the proportion of air and oxygen, the novel oxygen lance is used for the current furnace opening, the rough operation of only looking at the pressure control is replaced, and the advanced burning of the oxygen lance is avoided. Other parameters of furnace opening: the coke ratio of the whole furnace is 2.655kg/t without the clean coke of the furnace belly, and 3.436kg/t with the clean coke. The lower coke ratio of the normal material furnace body is 984kg/t, the middle coke ratio of the furnace body is 875kg/t, and the upper coke ratio of the furnace body is 722kg/tFe. Total iron 432t, total slag 433t, slag to iron ratio of 1.001. Blank Jiao Jiandu 0.95.95, normal material alkalinity 1.03, full furnace alkalinity 1.00; charge compression rate: 17% of a clean coke section; 15% of empty coke section; 13-8% of load material section. The furnace is opened by adopting an oxygen gun furnace opening mode, basic conditions are provided for measures such as rapid air charging, oxygen enrichment, silicon reduction and the like in the furnace, the yield is rapidly improved, the yield reaches 8119t in 14 days in 4 months, and the furnace opening is completed in 4 days in advance to reach the production target.
A graph of the wind velocity over 34 hours of the 2020 and 2018 furnace openings is shown in fig. 2.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (1)
1. A method for opening a blast furnace oxygen lance is characterized in that: the blast furnace opening oxygen lance comprises an oxygen lance body and is characterized in that the oxygen lance body comprises a tap hole connecting section and a gas source connecting section, wherein the tap hole connecting section comprises a tap hole connecting inner pipe and a tap hole connecting outer pipe, the tap hole connecting inner pipe is connected with the tap hole connecting outer pipe through a supporting rib, and a first compressed air conveying channel is formed between the tap hole connecting inner pipe and the tap hole connecting outer pipe; the iron notch connecting section is inserted into the iron notch section and provided with a groove, and the other end of the iron notch connecting section is provided with an external thread connecting part;
the air source connecting section comprises an air source connecting inner pipe and an air source connecting outer pipe, and the air source connecting inner pipe is connected with the air source connecting outer pipe through a supporting rib; one end of the air source connecting section is provided with an internal thread section matched with the external thread connecting part of the iron notch connecting section; the air source connecting section of the air source connecting section is connected with a compressed air conveying pipe and an oxygen supply conveying pipe; the compressed air conveying pipe and the oxygen supply conveying pipe are respectively provided with a set of accumulated flowmeter and an instantaneous flowmeter; the air source is connected with the inner pipe and the air source is connected with the outer pipe to form a second compressed air conveying channel, and the high-pressure air source conveying pipe is communicated with the second compressed air conveying channel; the oxygen supply conveying pipe is communicated with the air source connecting inner pipe; the end part of the air source connecting section at the air source connecting side is provided with a peeping mirror;
the internal thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner pipe and the iron notch connecting inner pipe form a communicated oxygen conveying channel;
before the furnace is opened, the iron notch connecting section of the oxygen lance is inserted into the iron notch, and the air outlet is upward;
in the initial stage of furnace opening, namely within 5 hours of furnace opening, the coke is burnt at the stage to provide heat for the blast furnace hearth, because the coke is burnt at the stage, firstly, the oxygen lance is ensured not to burn out, the lower flow oxygen supply is controlled, the supply amount is 5 m/hour, the higher flow compressed air supply is controlled, the maximum supply amount is 60 m/hour, the main purpose of the air is to cool the oxygen lance, avoid burning out, and the state of a tap hole is observed at any time through a peeping hole, so that the front section of the oxygen lance is kept not to lighten, which means that the front section of the oxygen lance is not burnt;
in the middle period of furnace opening, namely 5-10 hours of furnace opening, a small amount of slag is gradually generated at the moment, the flow rate of oxygen is gradually increased to 8-10 m/h, the flow rate of compressed air is kept unchanged, and the flow rate of compressed air is adjusted according to the condition of a peeping mirror; if the inside of the peeping mirror is still dark, reducing the flow rate of air by 2-3 m/h, continuously observing the condition in the peeping mirror, wherein the condition in the peeping mirror should be slightly lighted, keeping the flow rate of oxygen and air, if the inside of the peeping mirror is bright, and the air flow rate is adjusted to be maximum, reducing the oxygen flow rate, and observing for 10 minutes by reducing the oxygen flow rate by 2-3 m/h each time, and performing the next adjustment;
in the later stage of furnace opening, namely one hour before tapping, tapping of a front iron notch is needed in a specified time, at the moment, the oxygen flow is opened to the maximum of 15-20 m/h, and the flow of compressed air is reduced until the flow of the compressed air is closed to 0, so that the temperature of a connecting section of the iron notch is quickly increased, the heat of a hearth is improved, an oxygen gun seen from the peeping sight glass is bright until the oxygen gun is burnt, and slag iron flows out of a channel of the iron notch;
the gas source connecting section is used for timely disconnecting the gas source connecting position and carrying out tapping operation on the tapping hole if the phenomenon of slag iron burning occurs when the calculated generated slag iron meets the total amount requirement of the first tapping in the process of blowing in; if the condition of slag iron burning does not occur within the specified time, the oxygen is already opened to the maximum value and the compressed air is closed for more than 30 minutes, and the slag iron flow appears when the slag iron flow does not appear yet, the air source connecting section is required to be cut off, and the iron notch is opened so that the slag iron can flow out in time;
in the whole furnace opening process, the flow rate is regulated according to the condition of observing the peep sight on site, the accumulated usage amount of the compressed air is 500-700m, and the accumulated usage amount of the oxygen is 80-150 m.
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| CN203602642U (en) * | 2013-11-04 | 2014-05-21 | 宣威市恒邦磷化工业有限公司 | Adjustable combined type tuyere blowpipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220442A (en) * | 2011-06-08 | 2011-10-19 | 秦皇岛首秦金属材料有限公司 | Method for realizing opening of blast furnace or fast ignition during intermediate overhaul |
| CN203602642U (en) * | 2013-11-04 | 2014-05-21 | 宣威市恒邦磷化工业有限公司 | Adjustable combined type tuyere blowpipe |
| CN107955850A (en) * | 2017-11-16 | 2018-04-24 | 北京首钢股份有限公司 | A kind of blast furnace opening oxygen rifle |
| CN213012934U (en) * | 2020-08-28 | 2021-04-20 | 天津钢铁集团有限公司 | Blast furnace blow-in oxygen lance |
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